How to use the cat command in linux
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Note: after the awk command, there are not many complex commands, all basic commands.
Description:
Cat, the abbreviation of the word concatenate, outputs the contents of the file to stdout. When associated with the redirection operator (> or
When used in combination, it is generally used to connect multiple files.
Usage:
1. $cat file1 file2 file3
two。 It can be read not only from the file and spliced, but also from the standard input stream.
For example: $echo 'some content' | cat-file.txt
Explanation: here-represents the temporary file of 'some content', that is, the input stream
Example:
1. $cat cat.txt
Printed all the contents of cat.txt
2.$cat cat.txt | less
Check cat.txt, one page and one screen after joining less, which will be described in the less,more command later.
3.$cat-n cat.txt
Mark the line number before each line, including blank lines
4.$cat-b cat.txt
Mark the line number before a non-blank line
Interpretation-- help
Usage: cat [option]. [file].
Output [file] or standard input combination to standard output.
-A,-- show-all equals-vET
-b,-- number-nonblank to the non-empty outgoing line number
-e equals-vE
-E,-- show-ends displays "$" at the end of each line
-n,-- number numbers all lines of the output
-s,-- squeeze-blank does not output multiple blank lines
-t is equivalent to-vT
-T,-- show-tabs displays tabbed characters as ^ I.
-u (ignored)
-v,-- show-nonprinting uses ^ and M-references, except for LFD and TAB
-- help displays this help and exits
-- version displays version information and exits
If no file is specified, or if the file is "-", it is read from standard input.
Example:
Cat f-g outputs the content of f first, then the content of standard input, and finally the content of g.
Cat copies the contents of standard input to standard output.
Interpretation:
1. Cat-s file.txt
If there is a file that has this format:
Line1
# blank line
Line2 file2
Use this command.
Cat is more combined with other commands, and there is no complicated content of its own. If you are bored, try cat-A cat.txt and you will have unforgettable memories.
Related commands:
Cat's father-in-law is usually ordered by sed,tr.
Such as:
$cat file | sed's Compact OldUniverse G'
Display the file file and convert old to new without modifying the original file
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